Special carbon for the starting of a voltaic arc with ultra violet rays



Patented Oct. 26, 1926.

. UNITED STATES rural amvoma, or SPECIAL CARBON FOR THE STARTING OF A NoDrawing. Application filed November 14, 1923.

an improved carficial formation of s for heliotherapic on essentiallycom- The invention relates t bon for use in the arti specialultra-violet ray purposes; such inventi prises special homogeneouscarbons, which when applied to an appropriate lamp, yield the desiredresults.

he composition and the process for obtaining the special homogeneouscarbons for the production of the ultraviolet rays are as follows.

For the'manufacturing of the said homogeneous carbons, the Bremer systemis generally followed. The constituents of the mixture are approximatelyas follows I traces.

ordinary methods the ulverization and the perfect mixture of t e coponent parts is obtained by shakin up ,the powders in a closed cylinder,and t en add- .ing as much benzole as is ret uisite for the formation ofa thicl able hyd The compressed paste the holes inthe form of thethickness required for the arc, and is cut into lengths of about 25 cm.

The carbons thus formed are the air and well dried. after which they areready for baking. This is the most delicate of operations, it being theone upon which the successful production of the carbons depen s.

There are several kinds of ovens and raulic press. I I 1S withdrawn froma slender candle, of

exposed to coated,

Magnesium 1,604,544 PATENT OFFICE.

FLORENCE,

VOLTAIC AR ITALY.

0 WITH ULTRA VIOLET RAYS. Serial No. 674,714, and in Italy December 19,1922. methods of baking; but for the purpose in questionHofirnanns ovenis preferred, this oven being div ded into 24 compartments whereinbaking is efi'ected, the passage from one compartment to another beingeflected every 24 hours.

As a source of heat it he S emens is convenient to use apparatus, whichis a large gas producer. In spite of this improved method, however,continual superintendence and great experience are necess'a Finally, thecarbonsare rubbed clean'with a piece of linen cloth and soaked inarabic. This varnish encloses the carbon in protects it against a caseor coating, and humidity. The carbons, thus varnished or the sun, or tothe are exposed to open air, for one day, at least; and after thistreatment they remain smooth and glossy a-nddmay be handled'withoutsmudging the an s. .The apparatus for the obta ultra-violet rays produccaribons, must handle th an inment of the ed by means of said e carbonswith ease, manner as to ensure the desired the arc in relation to asuitable condenser and light-directing tube.

ly composed of the ents:.

Aerated graphite Retort-carbon Lamp-black r Vegetable carbon Metals andmetallo z'ds.

Calcium (Ca) g Strontium (Sr) 0.9 Ferrum (Fe) 0.9 Rare earths 0.97 Fluor(Fl) 2. 50 Silica (SiO 0.1 Aluminium Al),-sodium (Na), potassium (K)traces.

2. A process for th Parts. 76. 63

Per cent.

' 4 105 e production of carbone for the purpose described, in which theconstituents set forth in claim 1 are reduced to a powder, are thenmixed with benzol to form a paste, are then compressed and no dried byexposure to t into a paste, are then strained and subjected 0 highpressure to form carbons of candle form whlch are exposed to the air,

cleaned and are finally coated with gum and again exposed to the air.

PROF. LUIGI ARNONE. [1,. s.]

are then

